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Finding the Fourth Proportional to 85.68, 128.44 and 37.56

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Solution

The fourth proportional to 85.68, 128.44 and 37.56 is: 56.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.68 : 128.44 = 37.56 : x
  2. Step 2: Convert to fraction form
    85.68/128.44 = 37.56/x
  3. Step 3: Cross multiply
    85.68x = 128.44 × 37.56
  4. Step 4: Simplify right side
    85.68x = 4,824.21
  5. Step 5: Solve for x
    x = 4,824.21/85.68
  6. Step 6: Final answer
    x = 56.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.